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Bulb is the biggest green energy company

This claim is supported by data shared by Ofgem, the energy regulator, in their quarterly report 'Electricity supply market shares by company: Domestic(GB)' (as of October 2018). This report shows the market share of energy companies over time. All suppliers with a market share of 1% or above are shown individually. Suppliers with less than 1% market share are grouped together and listed under 'Small Suppliers'.

There are only three green energy suppliers listed as having a market share of 1% or above: Bulb, Co-operative Energy and Green Star energy. These suppliers are understood to be 'green energy companies' as they supply 100% renewable electricity. Ofgem defines a 'green tariff' as 'those tariffs with at least 100% renewable electricity'. You can find a full list of 100% Renewable Electricity suppliers here.

Of the three green energy suppliers in the report, Bulb hold the biggest market share (3%). The data shows that Bulb have seen the fastest growth of any supplier, moving from 0% market share in Q1 2017 to 3% market share in Q3 2018.

Q1 2017

Q2 2017

Q3 2017

Q4 2017

Q1 2018

Q2 2018

Q3 2018

British Gas

22%

22%

21%

20%

20%

20%

19%

SSE

15%

14%

14%

14%

14%

14%

13%

E.ON

14%

13%

13%

13%

13%

13%

13%

EDF

12%

12%

12%

11%

11%

11%

11%

Scottish Power

11%

11%

10%

10%

10%

10%

10%

npower

9%

10%

10%

10%

9%

9%

9%

First Utility

3%

3%

3%

3%

3%

3%

3%

OVO

2%

2%

3%

3%

3%

3%

4%

Co-op Energy

2%

1%

1%

1%

1%

1%

1%

Utilita

2%

2%

2%

2%

2%

2%

2%

Utility Warehouse

2%

2%

2%

2%

2%

2%

2%

Green Star

1%

1%

1%

1%

1%

1%

1%

Bulb

0%

0%

0%

1%

1%

2%

3%

Octopus

0%

0%

0%

0%

1%

1%

1%

Small Suppliers

6%

7%

8%

9%

8%

8%

8%

This chart shows the domestic electricity market shares for each of the six large suppliers, medium and small suppliers.